28results about How to "Realize temperature regulation" patented technology

The invention discloses a phase change microcapsule modification method which comprises the following steps: S1, selecting a paraffin phase change material or a hydrated salt phase change material, and adding 0.5-1.5 wt% of a chemical stabilizer to modify the thermal stability of the phase change material; s2, compounding a microcapsule wall material by using polyurethane (PU) and nano silicon dioxide (SiO2), and adding 1wt% of carbon nanotubes (CNT) and 0.5-2wt% of nano silicon dioxide (SiO2); s3, the microcapsule wall material is subjected to surface hydrophobic coating treatment, polymethyl methacrylate (PMMA) is sprayed to form a waterproof isolation layer, the modified microcapsule phase change material is obtained, and in the step S1, 0.5-1.5 wt% of graphene oxide (GO) is added for modification when the paraffin phase change material is selected. The preparation method is reasonable in design, energy storage, heat preservation and mechanical properties of PCM-UHPC are remarkably improved through multi-layer composite modification of the PCM microcapsules and the nano-enhancement technology of the UHPC matrix, and the preparation method is suitable for the fields of energy-saving buildings, temperature control infrastructures and the like and has wide application prospects.

The invention discloses a thermopile detector and a spectrum detector, relates to the technical field of spectrum detection, and provides a high-precision, high-performance, real-time and low-cost spectrum detection technical scheme. The thermopile detector comprises a substrate structure, a thermoelectric conversion structure and a phase change metamaterial structure, the thermoelectric conversion structure comprises a micro-heating structure and a thermocouple structure, the thermocouple structure is arranged on the substrate structure, the micro-heating structure is arranged above the thermocouple structure, and the phase change metamaterial structure is arranged above the micro-heating structure. The phase change metamaterial structure is used for absorbing light in a target wavelength range under the regulation and control of the micro-heating structure, converting the absorbed light energy into heat energy and transmitting the heat energy to the thermocouple structure, and the thermocouple structure is used for sensing first heat energy output by the micro-heating structure and second heat energy output by the phase change metamaterial structure; and the first heat energy and the second heat energy are converted into electric energy to be output.

This application relates to a control method, device, computer equipment, medium, and product for an energy storage system. The method includes: obtaining the correspondence between state combinations and temperature parameter value combinations of the energy storage system; the state combinations include seasonal modes and battery operating states; the temperature parameter value combinations include the respective temperature parameter values ​​corresponding to battery temperature parameters and liquid chiller temperature parameters, such that the liquid chiller of the energy storage system is in a low-energy-consumption state under the state combinations corresponding to the temperature parameter value combinations; forming the current state combination of the energy storage system based on the seasonal mode to which the current ambient temperature value belongs and the current battery operating state; determining the currently applicable temperature parameter value combination of the energy storage system based on the current state combination and the correspondence; and controlling the liquid chiller based on the currently applicable temperature parameter value combination of the energy storage system. This method can reduce the energy consumption of the liquid chiller.

The invention discloses an air conditioner indoor unit, an air conditioner and a control method thereof.The air conditioner indoor unit is characterized in that an evaporator of the air conditioner indoor unit is arranged on one side of a volute, a wind shield is arranged on the other side of the volute, a first air duct is formed between the wind shield and the volute, and a partition plate is rotatably arranged in the first air duct and divides the first air duct into a first air duct section and a second air duct section; the first air duct section is communicated with the fresh air opening, the second air duct section is communicated with the first air outlet, the double-suction fan is arranged in the volute, in the heat exchange fresh air mode, the double-suction fan enables fresh air entering through the fresh air opening and airflow entering from an air inlet of an air conditioner indoor unit and exchanging heat with an evaporator to be mixed in the volute, and temperature adjustment of the fresh air is achieved. And the comfort requirement of the user is met.

The utility model discloses a nutrient canal warmer convenient for temperature control. The nutrient canal warmer comprises a heating cylinder and a supporting part, a heating channel and a heat preservation channel which are through along the axis of the heating cylinder are formed in the heating cylinder and used for allowing a nutrient canal to be heated to penetrate through. The supporting part is arranged at the end part of the heating cylinder and is positioned between the end parts of the heating channel and the heat preservation channel; the supporting part is partially contacted with the nutrient canal; the middle of the heating cylinder is divided into a heating area and a heat preservation area which are provided with heating wires respectively, the heating area is close to the heating channel, and the heat preservation area is close to the heat preservation channel. The heating wire power of the heating area is greater than that of the heat preservation area; the nutrient tube sequentially penetrates through the heating channel and the heat preservation channel which are arranged in the heating cylinder, and then the heating wires with different powers are respectively arranged in the heating area and the heat preservation area to heat the nutrient tube to different degrees, so that the heat loss of a nutrient solution in the nutrient tube can be reduced; and the heat preservation effect of heating the nutrient solution conveyed by the patient through the heating cylinder is improved.

This invention relates to the field of bipolar membrane electrodialysis technology, and more particularly to a temperature control system, method, device, and storage medium for a bipolar membrane electrodialysis unit. The system includes: a conductivity sensor, with its detection end disposed within the bipolar membrane electrodialysis unit and the outlet water pipe; a temperature sensor, with its detection end disposed within the outlet water pipe; and a controller electrically connected to the temperature sensor and the conductivity sensor, used to acquire the temperature signal generated by the temperature sensor and the conductivity signal generated by the conductivity sensor, and to increase the cooling water circulation intensity of the bipolar membrane electrodialysis unit from an initial circulation intensity to a first circulation intensity based on the conductivity signal, and to further increase the cooling water circulation intensity to a second circulation intensity or decrease the cooling water circulation intensity to a third circulation intensity based on the temperature signal. The system provided by this invention can regulate the temperature of the bipolar membrane electrodialysis unit by controlling the cooling water circulation intensity.

The invention relates to the technical field of heat pump heaters, and discloses a heat pump heater based on rotating wheel dehumidification, which comprises an assembly shell, a heat pump mechanism and a rotating wheel dehumidification mechanism, an air inlet window and an air outlet window are respectively arranged at two ends of the assembly shell, and a temperature regulation and control area and a dehumidification area are arranged in the assembly shell; the temperature regulation and control area is located between the dehumidification area and the air outlet window, the rotating wheel dehumidification mechanism is arranged in the dehumidification area and comprises a fixedly-arranged dehumidification shell and two rotating wheel dehumidification assemblies arranged in the dehumidification shell, and a separation plate is fixed in the dehumidification shell; the inner cavity of the dehumidification shell is divided into a regeneration area and a rotating wheel dehumidification area by the separation plate from top to bottom, the rotating wheel dehumidification assemblies have the freedom degree of moving in the height direction of the dehumidification shell, and when one rotating wheel dehumidification assembly is located in the regeneration area, the other rotating wheel dehumidification assembly is located in the rotating wheel dehumidification area. And indoor air can be dehumidified while temperature regulation and control are achieved.

The invention provides an energy storage wall body, system and method with cooling, heating and power flexible resource adjusting ability, the energy storage wall body is used for enclosing a temperature control space, the energy storage wall body comprises a wall body structure, an energy storage material is arranged in the wall body structure; the air ducts are arranged on the two sides of the wall body structure, and the air ducts communicate with the temperature control space; one end of the heat pipe is fixed in the energy storage material in the wall body structure, the other end of the heat pipe is exposed out of the wall body structure, and the other end of the heat pipe is arranged in the air duct. The energy storage material is matched with the heat pipe and the air duct to regulate and control the temperature of the temperature control space, the economical efficiency of building energy consumption is reduced, and carbon emission is reduced.

This invention relates to a land-based sea cucumber culture pond and a method for cultivating sea cucumbers. The land-based culture pond comprises: several culture units, each including a net reef and pond water near the reef for sea cucumber cultivation; and several heat exchange pipes, each including a third pipe laid near the culture unit and cold water within the third pipe. The cold water flowing through the heat exchange pipes lowers the temperature of the pond water near the net reef by 2-5°C. This invention solves the problem of how to regulate the bottom water temperature of the land-based sea cucumber culture pond, thereby improving the survival rate of sea cucumbers during summer dormancy.

The invention discloses a heat management device for a vehicle, a control method for the heat management device and the vehicle. The heat management device comprises a first heat exchange loop; at least part of the second heat exchange loop selectively exchanges heat with the first heat exchange loop; at least part of the third heat exchange loop selectively exchanges heat with the second heat exchange loop; the fourth heat exchange loop is provided with an on-off valve so that at least part of the fourth heat exchange loop can selectively exchange heat with the first heat exchange loop; and the fifth heat exchange loop and the sixth heat exchange loop are both selectively communicated with the first heat exchange loop. The energy in the multiple heat exchange loops is coupled and utilized, so that the thermal management energy consumption of the whole vehicle is reduced.

The invention relates to the technical field of cables, and provides a constant-temperature power cable for a servo system and a preparation method thereof.The constant-temperature power cable comprises a supporting body, wire cores, an outer wrapping layer, a heat conduction layer, a limiting frame and a heating wire, the supporting body is of a star-shaped hollow structure, a plurality of first limiting grooves are formed in the circumferential face of the supporting body, and the wire cores are arranged in the first limiting grooves; the outer wrapping layer wraps the wire core and is provided with a strip-shaped groove, and a temperature sensing optical fiber is arranged in the strip-shaped groove; the heat conduction layer is made of a mesh material and is adhered with a heat conduction medium, and the heat conduction layer is wound on the outer wrapping layer; the limiting frame is provided with two second limiting grooves, and the limiting frame is arranged between the two wire cores; and the heating wire is arranged in the supporting body. According to the invention, through the arrangement of the support body and the limiting frame, the relative position stability of the plurality of wire cores can be ensured, the anti-extrusion capability of the cable is effectively improved, the support body is of a hollow structure and can be used for circulation of a cooling or heating medium, and the heating wire can heat the cable, so that the temperature adjustment of the cable is realized.

The invention provides a refrigerant unit and an energy storage system, and relates to the technical field of energy storage. The refrigerant unit is arranged outside the energy storage device; the refrigerant unit comprises a condenser and a compressor, and the compressor is connected with the condenser; the refrigerant unit is provided with an output port and an input port which are used for being connected with the heat exchanger, the input port is used for allowing refrigerants in the heat exchanger to enter the compressor, and the output port is used for allowing refrigerants in the condenser to enter the heat exchanger. The refrigerant unit is provided with an output port and an input port which are connected with the heat exchanger, so that the energy storage device and the refrigerant unit can be respectively produced and transported, the refrigerant unit and the heat exchanger of the energy storage device are assembled after the energy storage device and the heat exchanger reach a destination, and the complex energy storage system can be disassembled into a plurality of parts which are respectively transported to the destination and then assembled. And the transportation and assembly difficulty is reduced. The refrigerant unit is arranged outside the energy storage device, so that more space in the box body of the energy storage device can be used for accommodating the single batteries, and the energy density of the single batteries can be improved.

The utility model discloses a novel multifunctional terrestrial heat recovery heat pump unit, which relates to the technical field of heat pump units and comprises a unit and a heat exchange tube communicated with the lower end of the unit, the outer wall of the heat exchange tube is wrapped with a photovoltaic module, and a plurality of mounting plates arranged at intervals are fixedly arranged on one side, close to the heat exchange tube, of the photovoltaic module. A rotating rod is rotatably arranged in the mounting plate in a penetrating mode, a semiconductor chilling plate is fixedly arranged on the rod wall of the rotating rod in a zener mode, a temperature sensor is fixedly embedded in the pipe wall of the heat exchange pipe, a fixing ring is fixedly arranged at the lower end of the outer wall of the unit and arranged on the outer side of the heat exchange pipe in a sleeving mode, and a plurality of connecting rods are rotatably arranged on the outer wall of the fixing ring in a penetrating mode; the connecting rods and the rotating rod are fixed through connecting flanges, and the rod walls of the multiple connecting rods are jointly provided with a synchronous driving mechanism. The pipeline inside the machine room can be wrapped, the pipeline is heated or cooled according to the external environment temperature, it is guaranteed that the internal temperature of the pipeline is not affected, and the heat exchange stability of a unit is improved.

The utility model discloses a kind of energy storage device and its thermal management system, thermal management system includes temperature regulating flow path, temperature regulating flow path includes first heat exchange member and second heat exchange member, and the first heat exchange member is adapted to the energy storage converter heat exchange of the energy storage device, the second heat exchange member is adapted to the battery cell heat exchange of the energy storage device, the import of the second heat exchange member is connected at the export of the first heat exchange member. Thus, thermal management system can realize the temperature regulation of energy storage converter and battery cell, and can take into account the cooling efficiency of both.

This application relates to the technical field of machine tool electric spindles, and discloses a milling machine tool electric spindle, a fault detection system, and a method. The milling machine tool electric spindle includes a stator, inside which a rotor is housed. Cooling chambers are provided at both ends of the stator, and flywheels are installed at both ends of the rotor, located inside the cooling chambers. The cooling chambers are connected by a connecting pipe, on which a circulation pump is installed. The rotor includes a central shaft and an armature winding mounted on the central shaft. A central coolant channel is provided within the central shaft, and coolant inlet and outlet channels are provided on the flywheels, communicating with the central coolant channel. A coolant branch channel is provided within the armature winding, communicating with the central coolant channel. A partition is provided in the middle of the central coolant channel. A speed sensor and a temperature sensor are installed inside the cooling chambers, and a vibration sensor is installed on the stator. This application has the effect of monitoring the working status of the electric spindle and preventing spindle damage.

The utility model discloses a purification device for synergistically removing VOCs (volatile organic compounds) and NOx (nitrogen oxides), which belongs to the technical field of refining tail gas treatment, aims at solving the problems that the introduced waste gas cannot be primarily cooled and whether the emptied waste gas is completely purified cannot be ensured, and comprises a gas inlet pipe and a first fan, a filter is connected between the air inlet pipe and the first fan through a flange plate, the other end of the first fan is fixedly connected with a heat exchanger through a connecting pipe, and the other end of the heat exchanger is fixedly connected with a first heat storage chamber and a second heat storage chamber through connecting pipes; the heat exchanger is arranged on the ventilation pipeline, heat exchange can be conducted on waste gas introduced into the heat storage chamber, the temperature of the waste gas is lowered, and the situation that the waste gas cannot be fully combusted and decomposed by the incineration chamber due to the too high temperature of the waste gas is avoided; and the temperature regulation and control of the front-end denitration device are realized, so that the energy utilization and the NOx treatment are realized.

The application provides a temperature regulation method, device and equipment of a motor controller, a vehicle and a medium. In the method, a target temperature difference threshold and a target current threshold are determined according to the obtained driving time of multiple driving conditions and the current environment temperature, and then the controller temperature, the controller temperature difference, the controller power consumption and the temperature to be regulated of the motor controller are determined according to the cooling system parameters and the motor controller parameters, and then the temperature regulation instruction is determined in combination with the bus current, the target temperature difference threshold, the target current threshold, and the obtained target temperature threshold and target power consumption threshold, and finally at least one of the cooling system and the driving motor is controlled according to the temperature regulation instruction. According to the bus current, the controller temperature, the controller temperature difference and the controller power consumption, the cooling system and the driving motor are controlled, the temperature regulation of the motor controller is realized, and the regulation accuracy is improved.

The invention discloses a temperature regulation and control method, device and equipment and a medium, relates to the technical field of temperature control, and is applied to a temperature regulation and control system. The temperature regulation and control system comprises a module to be subjected to temperature control, a semiconductor cooler and auxiliary temperature control equipment in contact with a non-temperature-control surface of the semiconductor cooler, and the method comprises the following steps: controlling a heat transmission direction and a heat transmission quantity between a temperature control surface and the non-temperature-control surface through the semiconductor cooler based on acquired current polarity and current magnitude, the temperature of the temperature control surface is regulated and controlled through heat transmission between the temperature control surface and the non-temperature control surface based on the heat transmission direction and the heat transmission quantity; regulating and controlling the temperature of the module to be subjected to temperature control based on the temperature control surface; and the auxiliary temperature control equipment receives the heat of the non-temperature-control surface, or transmits the heat of the auxiliary temperature control equipment to the non-temperature-control surface. Rapid and effective temperature control can be realized so as to improve the multi-temperature-point calibration efficiency of the module to be subjected to temperature control.

The utility model belongs to the technical field of medicine manufacturing, and particularly relates to a medicine preparation tank capable of rapidly cooling and heating. Comprising a batching tank, a heat exchange device and a jacket heat exchange device, the jacket heat exchange device is used for storing a heat exchange medium and heating or cooling medicine in the batching tank through the heat exchange medium, and the heat exchange device is used for heating or cooling the heat exchange medium flowing between the jacket heat exchange device and the batching tank. According to the medicine preparation tank capable of rapidly cooling and heating, the heat exchange medium is directly heated and cooled through the heat exchange device, temperature adjustment is achieved, the heat exchange medium does not need to be replaced, and the problem of mutual pollution caused by difference of a heating medium and a cooling medium in a traditional process is solved; the purity and the safety in the medicine preparation process are effectively improved. The tedious steps of medium emptying, cleaning, refilling and the like are not needed, so that according to the scheme, the cooling time can be greatly shortened to several minutes or even shorter, and the temperature adjusting time is remarkably shortened.

This application relates to the field of packaging printing equipment, and in particular to a high-efficiency printing process for packaging containers, comprising the following steps: S1, lamination process; S2, varnishing process; S3, ink control; S4, die-cutting and creasing process; S5, automated cutting. The oil storage tank is equipped with a stirring device, which includes a stirring shaft and a stirring wheel. The stirring shaft drives the stirring wheel to stir the ink in the oil storage tank. The stirring shaft is connected to an intermittent drive device, which intermittently drives the stirring shaft to rotate. The purpose of this application is to effectively ensure that the ink maintains its performance during long-term storage, and that the ink can be readily used when the packaging printing process requires it, thereby effectively ensuring the printing efficiency of the packaging printing process.

The waste heat recycling system comprises a cooking bench, a smoke exhaust ventilator and a plurality of stove cores, a cold water pipe and a hot water pipe are arranged on the inner side of the cooking bench, a heat absorption water tank is concentrically arranged on the cooking bench around each stove core, a partition plate is arranged in the heat absorption water tank, and the partition plate is arranged in the cooking bench. A plurality of heat absorption pipes arranged in rows are arranged in an exhaust fume collecting hood of the range hood, strip-shaped scrapers sleeve the heat absorption pipes, and a driving mechanism for driving the strip-shaped scrapers to move back and forth in the length direction of the heat absorption pipes is mounted on the exhaust fume collecting hood. A water inlet of the water inlet header pipe is connected with a tap water pipe, the water outlet header pipe is communicated with the cold water pipe through a down pipe, and a water outlet of the hot water pipe is sequentially connected with a temperature adjusting water tank and a heat preservation water tank. In conclusion, the waste heat recovery device has the advantages of being high in waste heat recovery rate, convenient to use hot water and capable of reducing environmental pollution.

The utility model belongs to the technical field of semiconductor manufacturing, and particularly relates to an induction coil structure and an adjusting device, the induction coil structure comprises a plurality of induction coils, the plurality of induction coils are sequentially sleeved from the center to the outer side, the plurality of induction coils are independently arranged, and the plurality of induction coils are arranged below a reaction chamber. And the adjusting device is used for adjusting the position of the induction coil structure, a vertical adjusting structure is arranged below the induction coils, and the vertical adjusting structure is used for adjusting the height of each induction coil. According to the utility model, the uniformity of the heating temperature of the substrate can be adjusted.

The invention belongs to the technical field of solar heating, and particularly relates to a backflow type solar air heat collector which comprises a first box body, a second box body, a heat-absorbing and air-sucking part is arranged on the top of the first box body, and other side walls of the first box body are arranged in a heat-insulating mode. The air inlet end of the air exhaust assembly is arranged at one end of the first box body in a communicating manner; the air inlet end of the four-way joint is communicated with the air outlet end of the air exhaust assembly, the third air outlet end of the four-way joint is communicated with a heat collector outlet through an adjustable valve, the first air outlet end and the second air outlet end of the four-way joint are respectively communicated with the air inlet end of an air return part, and the air outlet end of the air return part is arranged towards the air inlet end of the heat absorption and air suction part; the air inlet end of the air return part sucks air in the first box body and the air is sprayed out from the air outlet end of the air return part to form an air curtain. According to the device, high-speed jet flow is generated by pumping air from the interior of the device, an air curtain is formed on the surface of the heat absorption and air suction part, the heat insulation and heat preservation effects can be achieved, and meanwhile multiple times of cyclic heating of air can be achieved.

The utility model relates to heat pump type cold and warm air conditioning unit technical field discloses a heat pump type cold and warm air conditioning unit for logistics vehicle, including logistics vehicle body, cab and cargo compartment still include: engine compartment is set up in the cab bottom, frequency conversion compressor is installed in the engine compartment, is used for through mechanical compression effect drive refrigerant circulation flow in heat pump type cold and warm air conditioning unit system, intelligent reversing valve group is set up as the triangular valve group structure, in the utility model, through a set of integrated frequency conversion compressor, intelligent reversing valve group, composite heat exchange core, bidirectional heat exchange module and control module's heat pump type cold and warm air conditioning unit, has realized the temperature regulation of cab and cargo compartment. This design greatly simplifies the system structure, reduces the cost of equipment purchase, installation and maintenance. Solve the high cost brought by repeated configuration of air conditioning equipment in the prior art, effectively reduce the overall cost of the logistics vehicle, improve the economic benefit.

The utility model discloses a prefabricated square pile mold temperature regulation and control system which comprises a mold box, a mold groove is fixedly connected to the middle of the mold box, isolation plates are fixedly connected to the interiors of the two sides of the mold box, air outlets are formed between the upper portion of the mold groove and the isolation plates, and a plurality of sets of vent holes are formed in the isolation plates. A rotating shaft is rotatably connected to the interior of the vent hole, a baffle is fixedly connected to the outer side of the rotating shaft, a control groove is formed in the lower portion of one side of the isolation plate, the lower portion of the rotating shaft penetrates through the control groove to be fixedly connected with a connecting gear, one side of the connecting gear is in meshed connection with a rack, and the rack is slidably connected to the interior of the control groove; a bent plate is fixedly connected to one side of the rack, two sets of air inlets are fixedly connected to the two sides of the mold box, a sealing door is connected to the upper portion of an air outlet through a rotating shaft, the flow amount of exchanged air can be controlled, the regulation and control efficiency can be controlled, and cracks, caused by too large temperature change, of the square pile are prevented.

The utility model provides a ground source heat pump system, an energy storage power station comprises a plurality of energy storage cabinets, each energy storage cabinet is internally provided with a heat exchange piece, and the ground source heat pump system comprises a heat pump air conditioner; one end of the liquid inlet pipeline communicates with the input ends of the heat exchange pieces of the multiple energy storage cabinets, and the other end of the liquid inlet pipeline is arranged in the output end of the heat pump air conditioner; one end of the liquid outlet pipeline communicates with the output ends of the heat exchange pieces of the multiple energy storage cabinets, and the other end of the liquid outlet pipeline is arranged in the input end of the heat pump air conditioner; the multiple heat exchange pieces, the liquid inlet pipeline and the liquid outlet pipeline jointly form a first loop. By applying the technical scheme of the utility model, the technical problem of high cost in related technologies can be improved.

The utility model relates to the technical field of optical fiber laser, specifically relates to a kind of based on phase continuous sweep frequency optical fiber laser, including shell, the inside one side of shell is fixedly installed with the multimode pump transmitter for emitting laser source, the output end of multimode pump transmitter is provided with phase modulator, the other end of phase modulator is provided with first fiber grating, the one side of first fiber grating away from phase modulator is connected with optical fiber body, the other end of optical fiber body is fixedly connected with second fiber grating, the other side of second fiber grating is fixedly connected with the multimode pump coupler of emission gain rear laser.Compared with prior art, the utility model, by being provided with first fiber grating and second fiber grating cooperate optical resonant cavity, and in optical resonant cavity outer wrapping heat pipe, the frequency of stable optical resonant cavity is ensured the stability of laser output frequency, and optical path length drift caused by heat effect can be reduced.

The application belongs to the technical field of power distribution equipment, and particularly relates to a full-scene intelligent lightning protection and anti-interference metering box, which comprises a metal outer box, an incoming line partition plate and an outgoing line partition plate fixed on the two sides of the inside of the metal outer box, a wiring mechanism installed on the side wall of the incoming line partition plate and the outgoing line partition plate, a box door arranged on the outside of the metal outer box, and a surge protector isolation cover arranged on the inside of the metal outer box and located at the position of the side of the incoming line partition plate. The application can construct a multi-level electromagnetic shielding system, optimize auxiliary shielding performance, improve the anti-interference ability and the stability of the metering accuracy of the metering box, ensure the stability of the working environment temperature of the surge protector, improve the lightning protection reliability, improve the applicability of the full scene, improve the continuous lightning protection performance of the surge protector, and remind the personnel to maintain the metering box in time when the sealing of the box door fails, so that the electromagnetic shielding effect of the metering box is maintained.